Water body crossing pipeline water distribution system and method

Abstract

The application discloses a water body crossing pipeline water distribution system and method, and belongs to the technical field of water body heat storage. High-temperature inlet and outlet water pipes and low-temperature inlet and outlet water pipes are horizontally crossed over the water body and are supported by pipeline support foundations on both banks, and meanwhile, downwardly extending pipes from the middle of the crossing pipeline penetrate through floating heat preservation top covers into the water body to install water distributors, so that the pipeline system is completely separated from the bottom of the water body, and holes need not to be opened on a waterproof and anti-seepage bottom film or underwater concrete foundations are not needed to be built, thereby fundamentally eliminating the risk of seepage at the bottom of the pool, greatly reducing the construction difficulty and engineering cost. In addition, the water distribution mode of the water distributors suspendedly extending into the water body not only ensures that the water distributors stably distribute water in the water body according to a predetermined height to maintain the thermocline, but also effectively isolates the interference of the external environment on the water body, and the reliability, economy and temperature uniformity of the heat storage and cold storage system are improved as a whole.

Description

Technical Field

[0001] This invention belongs to the field of water body heat storage technology, specifically relating to a water distribution system and method that spans pipelines. Background Technology

[0002] Aquatic thermal storage technology is an energy storage technology that utilizes the high specific heat capacity of water to store heat or cold and release it when needed. Water has a large specific heat capacity, meaning that a unit volume of water can store a significant amount of heat. Furthermore, water has good thermal conductivity, facilitating heat transfer and exchange, resulting in high thermal storage efficiency.

[0003] In related technologies, water heat storage mainly relies on water as the heat storage medium. Although water has advantages such as low cost and easy access, the existing mature water heat storage technology is large-scale hot water storage tank technology. There are many related cases at home and abroad. However, the large-scale hot water storage tank technology is difficult to promote due to its high engineering cost.

[0004] Chinese patent application number 201720277897.1 is the first authorized patent in China to reference Danish cross-seasonal natural water body thermal storage technology. However, its technical solution involves installing the inlet and outlet pipes of the water distributor on a concrete base at the bottom of the water body. The waterproof and seepage-proof membrane at the bottom of the natural water body needs to be opened and sealed to prevent leakage with the concrete base. Moreover, the concrete base and the bottom-mounted water distributor solution is expensive and the construction process is complex. In addition, a set of high-temperature and low-temperature water distributors can easily create dead zones in water bodies with rectangular or irregularly shaped openings, especially for water bodies with narrow and elongated openings. Multiple water distributors need to be designed to achieve uniform distribution of high and low temperature water in the water body and stability of the temperature gradient layer, thereby improving the thermal and cold storage efficiency of the water body. Summary of the Invention

[0005] The purpose of this invention is to provide a water distribution system and method that spans pipelines to solve the technical problem of uniform water temperature distribution in existing elongated or irregularly shaped heat and cold storage water bodies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A water distribution system spanning a pipeline includes a heat storage and cold storage water body, with a high-temperature inlet / outlet water pipe and a low-temperature inlet / outlet water pipe spanning above the heat storage and cold storage water body; A high-temperature water distributor and a low-temperature water distributor are provided vertically downward from the middle of the high-temperature water inlet and outlet pipes and the low-temperature water inlet and outlet pipes, respectively, and the high-temperature water distributor and the low-temperature water distributor extend into the water body. Both ends of the high-temperature inlet and outlet water pipes and the low-temperature inlet and outlet water pipes are equipped with inlet and outlet water control valves, which are used to cooperate with the water pump to control the injection or extraction of water. The bottom and sides of the heat and cold storage water body are covered with a waterproof and seepage-proof bottom membrane.

[0007] As an optional embodiment of the present invention, multiple sets of high-temperature inlet and outlet water pipes and low-temperature inlet and outlet water pipes are arranged laterally across the water body along the length direction of the heat storage and cold storage water body, and the high-temperature inlet and outlet water pipes and the low-temperature inlet and outlet water pipes in each set are arranged in pairs.

[0008] As an optional embodiment of the present invention, one or more symmetrically distributed pipes extend vertically downward from the middle of each transversely crossing pipe, and the high-temperature water distributor or the low-temperature water distributor is installed at the end of each extended pipe.

[0009] As an optional embodiment of the present invention, it also includes a floating heat-insulating top cover, which covers the upper surface of the heat and cold storage water body.

[0010] As an optional embodiment of the present invention, it also includes a pipe support foundation, which is set on both banks of the heat storage and cold storage water body to support and fix the high temperature inlet and outlet water pipes and the low temperature inlet and outlet water pipes that cross laterally.

[0011] As an optional embodiment of the present invention, the planar opening shape of the heat storage and cold storage water body is any one of square, rectangle, ellipse, circle or slender polygon.

[0012] As an optional embodiment of the present invention, the surrounding slopes of the heat and cold storage water body are slopes formed by leveling unhardened soil, and the angle between the slope and the horizontal bottom surface ranges from 135° to 160°.

[0013] As an optional embodiment of the present invention, the high-temperature water distributor or the low-temperature water distributor is at least one of the following shapes: disc-shaped, octagonal, H-shaped, or radial tube-shaped.

[0014] As an optional embodiment of the present invention, it also includes several sets of water temperature sensors, each set of which is arranged vertically along the water depth direction to detect the water temperature distribution at different depths.

[0015] This invention provides a method for water distribution across a pipeline, comprising the following steps: Based on the surface opening shape of the heat and cold storage water body, several sets of high-temperature inlet and outlet water pipes and low-temperature inlet and outlet water pipes are laid transversely across the water body along the length direction. Based on the water flow required for heat or cold storage, configure the corresponding number of high-temperature water distributors and low-temperature water distributors, and control the water flow velocity through each water distributor to be within the laminar flow and low Reynolds number range. Adjust the flow rate of thermal or cold water storage based on the peak-shaving and frequency regulation signals of the power grid or the peak-shaving demand of heat or cold sources; By utilizing the opening and closing of the inlet and outlet control valves at both ends of the high-temperature inlet and outlet pipes and the low-temperature inlet and outlet pipes, the operation of unidirectional injection or unidirectional extraction of high-temperature or low-temperature water can be achieved, ensuring the balance of the inlet and outlet water volumes of high-temperature and low-temperature water.

[0016] The beneficial effects of this invention are as follows: This invention provides a water distribution system that spans a water body via a pipeline. High-temperature and low-temperature inlet / outlet pipes laterally cross the water body, supported by pipeline foundations on both banks. Simultaneously, a pipe extends downwards from the middle of the crossing pipe, passing through a floating insulated top cover to enter the water body to install a water distributor. This achieves complete separation of the pipeline system from the bottom of the water body, eliminating the need for drilling holes in the waterproof and seepage-proof bottom membrane or constructing underwater concrete foundations. This fundamentally eliminates the risk of leakage at the bottom of the pool, significantly reducing construction difficulty and project costs. Furthermore, the suspended water distribution method ensures that the water distributor stably distributes water at a predetermined height within the water body to maintain the inclined temperature layer, while effectively isolating the water body from external environmental interference. Overall, this improves the reliability, economy, and temperature uniformity of the heat and cold storage system.

[0017] This invention also provides a method for water distribution across pipelines. Multiple sets of transverse pipelines are arranged along the length of the water body according to the specific shape of the water body's opening. The number of water distributors is rationally configured based on flow requirements to control the outflow velocity. This ensures uniform diffusion of high and low temperature water throughout the entire narrow or irregular water body area, avoiding the formation of flow dead zones. Simultaneously, the flow rate of thermal and cold storage water is dynamically adjusted according to the grid peak-shaving and frequency regulation or cold and heat source load requirements. Combined with the opening and closing combinations of valves at both ends and flow balance control, this achieves precise unidirectional flow of high and low temperature water into and out of the water body and water volume conservation, while also enhancing the profitability of the energy storage system in power auxiliary services. Furthermore, the measured temperature data obtained from temperature sensors at different areas and depths of the water body is iteratively verified against the simulation model, continuously optimizing the model's accuracy. This provides a reliable basis for adjusting operational strategies and optimizing the engineering design of large-scale thermal and cold storage bodies, ultimately significantly improving the energy utilization efficiency and operational stability of the thermal and cold storage water bodies. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of a water distribution system spanning a pipeline according to an embodiment of the present invention; Figure 2 This is a pipeline distribution diagram of a water distribution system spanning a pipeline in an embodiment of the present invention; Figure 3 This is a flowchart of a water distribution method across a pipeline according to an embodiment of the present invention.

[0019] In the diagram, 1. Thermal and cold water storage body; 2. High-temperature inlet and outlet water pipes; 3. Low-temperature inlet and outlet water pipes; 4. Inlet and outlet water control valves; 5. High-temperature water distributor; 6. Low-temperature water distributor; 7. Pipe support foundation; 8. Floating insulated top cover; 9. Waterproof and seepage-proof bottom membrane. Detailed Implementation

[0020] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0023] like Figure 1 As shown, the present invention provides a water distribution system that spans a pipeline, comprising a heat and cold storage water body 1, a high-temperature inlet and outlet water pipe 2, a low-temperature inlet and outlet water pipe 3, several inlet and outlet water control valves 4, a high-temperature water distributor 5, a low-temperature water distributor 6, a pipeline support foundation 7, a floating heat-insulating top cover 8, and a waterproof and seepage-proof bottom membrane 9.

[0024] The heat and cold storage water body 1 is a pool excavated on or below ground level. In this embodiment, the cross-section of the pool is an inverted trapezoid, meaning the four side walls of the pool are inwardly sloping surfaces, and the bottom is a horizontal surface. The angle between the sloping surfaces and the horizontal bottom surface is preferably between 135° and 160°. A more preferred approach is to make the ratio of the shorter side of the vertical projection of the sloping surface to the longer side of the horizontal projection approximately 1:2, meaning the longer horizontal side of the right triangle corresponding to the sloping surface is twice the shorter vertical side. This design maintains the stability of the pool slope and prevents collapse. Furthermore, this angle facilitates the laying and reinforcement of the waterproof and seepage-proof bottom membrane 9 during construction, eliminating the need for hardening the sloping surface; the existing soil can be leveled directly, significantly reducing civil engineering costs. The excavated bottom surface and all sloping surfaces of the heat and cold storage water body 1 are covered with a waterproof and seepage-proof bottom membrane 9 to isolate the water in the pool from the external soil, preventing the loss of the heat storage medium. Depending on the actual site conditions and capacity requirements, the planar opening shape of the thermal and cold water body 1 can be any shape, such as square, rectangle, ellipse, circle, or slender polygon. This embodiment is particularly suitable for solving the problem of uneven water distribution in slender rectangular openings with narrow widths and long lengths.

[0025] A floating insulating top cover 8 is placed over the surface of the heat and cold storage water body 1. The floating insulating top cover 8 floats directly on the water surface and rises and falls with the water level. Its functions include: heat insulation, significantly reducing heat exchange loss between the water body and the external atmosphere, and maintaining heat and cold storage efficiency; isolating the water surface from direct wind disturbance, protecting the stable internal thermocline layer from damage; and preventing rainwater, dust, debris, etc. from falling into the water body, thus maintaining water quality.

[0026] The high-temperature inlet / outlet pipe 2 and the low-temperature inlet / outlet pipe 3 are arranged to cross the heat and cold storage water body 1 laterally. The pipe extends vertically downward in the middle of the horizontal crossing pipe, passes through the floating insulated top cover 8 and enters the water body. The high-temperature water distributor 5 and the low-temperature water distributor 6 are installed at the end of the vertically extended pipe. The horizontal crossing pipe is fixed and supported by the pipe support foundation 7 set on both sides of the water body. Several inlet / outlet control valves 4 are arranged on the outside of the pipe support foundation 7 at both ends of the horizontal crossing pipe. The injection or extraction of high-temperature water or low-temperature water is realized by opening and closing the valves and starting and stopping the corresponding inlet / outlet water pumps.

[0027] The pipe support foundation 7 is used to fix and support the crossing pipe, allowing the pipe to span the water body without direct contact with the floating insulated top cover 8 or the water body. This avoids the sealing problem of the geomembrane opening caused by the pipe needing to penetrate the bottom or wall of the pool in traditional solutions. The pipe support foundation 7 can be a rigid foundation made of cast concrete or precast.

[0028] like Figure 2As shown, several sets of high-temperature inlet / outlet pipes 2 and low-temperature inlet / outlet pipes 3 are arranged along the length of the thermal and cold water body 1, ensuring that the high-temperature inlet / outlet pipes 2 and low-temperature inlet / outlet pipes 3 are paired. For example, two high-temperature inlet / outlet pipes and two low-temperature inlet / outlet pipes are evenly arranged along the length of the pool, with one high-temperature inlet / outlet pipe 2 and one low-temperature inlet / outlet pipe 3 corresponding to one pair. This paired arrangement and the maintenance of balanced inlet and outlet flow rates during operation can prevent changes in the overall water level of the pool or local overflows caused by unilateral water accumulation.

[0029] At the midpoint of each horizontally spanning high-temperature or low-temperature inlet / outlet pipe 2 or 3, one or several pipes extend vertically downwards. These extended pipes pass through the floating insulated top cover 8 and enter the interior of the heat and cold storage water body 1. The extended pipes are suspended, meaning they do not contact the bottom or walls of the pool, completely avoiding the need for pipes to penetrate the waterproof and seepage-proof bottom membrane 9. This eliminates the risk of leakage that may occur due to pipe penetration of the bottom membrane, significantly reducing construction difficulty and project cost.

[0030] At the end of the downward-extending pipe, a high-temperature water distributor 5 or a low-temperature water distributor 6 is installed. Depending on the water depth and distribution strategy, the extension length of the pipe can vary, allowing the high-temperature water distributor 5 and the low-temperature water distributor 6 to be located at different heights in the vertical direction. Typically, the high-temperature water distributor 5 is positioned in the upper-middle part of the heat and cold storage water body 1, while the low-temperature water distributor 6 is positioned in the lower-middle part, utilizing the principle of water thermal stratification to form a stable inclined temperature layer. The water distributor disperses the incoming or extracted water into the water body at a low speed and uniformly. The shapes of the high-temperature water distributor 5 and the low-temperature water distributor 6 can be any one or a combination of disc-shaped, octagonal, H-shaped, or radial tube-shaped designs, specifically selected based on the required water distribution area and flow velocity field uniformity requirements.

[0031] Several inlet and outlet water control valves 4 are arranged on the outside of the pipe support foundation 7 that spans both ends of each transverse pipe, i.e., at the pipe ports located outside the water body. By controlling the opening or closing of the valves and in conjunction with the start and stop of the corresponding water pumps, one-way injection and extraction operations of high-temperature or low-temperature water can be achieved. For example, in heat storage mode, the inlet and outlet valves at both ends of the high-temperature inlet and outlet water pipes are opened, the heat source side water pump is started, and the externally heated high-temperature water is injected into the upper part of the water tank, while the low-temperature water is extracted from the lower part of the water tank; in heat release mode, the operation is reversed, the high-temperature water is extracted and supplied to the user side, and the low-temperature water flows back into the lower part of the tank.

[0032] To monitor the temperature stratification and water distribution uniformity within the water body in real time, the system is equipped with multiple sets of water temperature sensors. Each set of sensors is arranged vertically along the water depth direction, and can consist of multiple temperature probes spaced at different heights on a single vertical cable. Each sensor set corresponds to a water distribution area or a pair of high-temperature and low-temperature water distributors, used to acquire real-time temperature data at different depths. This data is then compared and verified with simulation model calculations to guide operational control and optimization design.

[0033] This invention also provides a method for water distribution across a pipeline, such as... Figure 3 As shown, it includes the following steps: Based on the surface opening shape of the heat and cold storage water body, several sets of high-temperature inlet and outlet water pipes and low-temperature inlet and outlet water pipes are laid transversely across the water body along the length direction. Based on the water flow required for heat or cold storage, configure the corresponding number of high-temperature water distributors and low-temperature water distributors, and control the water flow velocity through each water distributor to be within the laminar flow and low Reynolds number range. Adjust the flow rate of thermal or cold water storage based on the peak-shaving and frequency regulation signals of the power grid or the peak-shaving demand of heat or cold sources; By utilizing the opening and closing of the inlet and outlet control valves at both ends of the high-temperature inlet and outlet pipes and the low-temperature inlet and outlet pipes, the operation of unidirectional injection or unidirectional extraction of high-temperature or low-temperature water can be achieved, ensuring the balance of the inlet and outlet water volumes of high-temperature and low-temperature water.

[0034] The detailed steps are as follows: S1: Based on the surface opening shape of the heat and cold storage water body 1, it is preferable to lay several sets of high-temperature inlet and outlet pipes 2 and low-temperature inlet and outlet pipes 3 along the length of the water body, so that they cross the width of the water body laterally. Pipe support foundations 7 are set up on both banks in the width direction of the water body to firmly support and fix the crossing pipes. For slender polygonal opening water bodies, multiple sets of crossing pipes should be arranged at intervals along the long axis to ensure that the water distribution covers the entire water body area and eliminates flow dead zones; S2: Based on the design flow rate of the water body for heat storage or cold storage, configure the total number of high-temperature water distributors 5 and low-temperature water distributors 6. The larger the design flow rate, the more water distributors should be set to distribute the total flow rate to each water distributor, ensuring that the outlet velocity of each water distributor is in the laminar flow or low Reynolds number range, and preventing local jets from being ejected from the water distributor at high speed, which would damage the stability of the thermocline. S3: The thermal and cold storage capacity and operating flow rate of thermal and cold storage water body 1 are designed to match the peak-shaving capacity of the heat or cold source it serves, as well as the peak-shaving and frequency regulation requirements of the power system. During operation, the real-time adjustment of the thermal and cold storage water flow rate is used to respond to load regulation signals from thermal power units, output fluctuation signals from new energy power plants, or peak-shaving and frequency regulation commands given by the power grid, thereby improving the project's profitability while providing energy storage services. S4: In heat storage or cold storage conditions, by coordinating the opening and closing of the inlet and outlet control valves 4 at both ends of the high-temperature inlet / outlet pipe 2 and the low-temperature inlet / outlet pipe 3, and in conjunction with the start and stop of the corresponding water pumps, unidirectional injection and extraction of high-temperature or low-temperature water can be achieved. For example, during heat storage, the high-temperature water injection valve and the low-temperature water extraction valve are opened, and the water pump drives the medium to flow in a directional manner; during heat release, the high-temperature water extraction valve and the low-temperature water injection valve are opened to keep the flow direction opposite. By controlling the valve opening and the water pump flow rate, a real-time balance between the total inlet and outlet water volume on the high-temperature side and the total inlet and outlet water volume on the low-temperature side is strictly maintained to avoid significant changes in the total water volume of the pool. S5: During operation, multiple sets of water temperature sensors deployed at different planar locations and depths within the water body continuously or periodically measure the temperature distribution data. The measured temperature distribution data are compared and analyzed with the simulation results obtained from the computational fluid dynamics simulation model of the water body. Based on the deviations, the parameters or boundary conditions of the simulation model are continuously adjusted, thereby continuously improving the accuracy of simulation predictions. A high-confidence simulation model can further guide the optimized design and refined adjustment of operational strategies for subsequent similar projects.

[0035] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A water distribution system that spans a pipeline, characterized in that, It includes a heat storage and cold storage water body (1), and a high temperature inlet and outlet water pipe (2) and a low temperature inlet and outlet water pipe (3) are installed above the heat storage and cold storage water body (1). A high-temperature water distributor (5) and a low-temperature water distributor (6) are provided vertically downward from the middle of the high-temperature water inlet / outlet pipe (2) and the low-temperature water inlet / outlet pipe (3), respectively, and the high-temperature water distributor (5) and the low-temperature water distributor (6) extend into the water body. Both ends of the high-temperature inlet / outlet water pipe (2) and the low-temperature inlet / outlet water pipe (3) are equipped with inlet / outlet water control valves (4) to cooperate with the water pump to control the injection or extraction of water flow. The bottom and sides of the heat storage and cold storage water body (1) are covered with a waterproof and seepage-proof bottom membrane (9).

2. A water distribution system spanning a pipeline according to claim 1, characterized in that, Multiple sets of high-temperature inlet and outlet water pipes (2) and low-temperature inlet and outlet water pipes (3) are arranged laterally across the water body along the length direction of the heat storage and cold storage water body (1), and the high-temperature inlet and outlet water pipes (2) and the low-temperature inlet and outlet water pipes (3) in each set are arranged in pairs.

3. A water distribution system spanning a pipeline according to claim 2, characterized in that, One or more symmetrically distributed pipes extend vertically downward from the middle of each transverse crossing pipe, and the high-temperature water distributor (5) or the low-temperature water distributor (6) is installed at the end of each extended pipe.

4. A water distribution system spanning a pipeline according to claim 1, characterized in that, It also includes a floating heat-insulating top cover (8), which covers the upper surface of the heat-storage and cold-storage water body (1).

5. A water distribution system spanning a pipeline according to claim 1, characterized in that, It also includes a pipe support foundation (7), which is set on both banks of the heat storage and cold storage water body (1) to support and fix the high temperature inlet and outlet water pipe (2) and the low temperature inlet and outlet water pipe (3) that cross laterally.

6. A water distribution system spanning a pipeline according to claim 1, characterized in that, The planar opening shape of the heat and cold storage water body (1) is any one of square, rectangle, ellipse, circle or slender polygon.

7. A water distribution system spanning a pipeline according to claim 1, characterized in that, The surrounding slopes of the heat and cold storage water body (1) are unhardened soil slopes, and the angle between the slope and the horizontal bottom surface ranges from 135° to 160°.

8. A water distribution system spanning a pipeline according to claim 1, characterized in that, The high-temperature water distributor (5) or the low-temperature water distributor (6) is at least one of the following shapes: disc-shaped, octagonal, H-shaped, or radial tube-shaped.

9. A water distribution system spanning a pipeline according to claim 1, characterized in that, It also includes several sets of water temperature sensors, each set of which is arranged vertically along the water depth direction to detect the water temperature distribution at different depths.

10. A method for distributing water across a pipeline, characterized in that, A water distribution system across a pipeline according to any one of claims 1-9 includes the following steps: Based on the surface opening shape of the heat and cold storage water body (1), several sets of high temperature inlet and outlet water pipes (2) and low temperature inlet and outlet water pipes (3) are laid horizontally across the water body along the length direction. Based on the water flow required for heat storage or cold storage, configure the corresponding number of high-temperature water distributors (5) and low-temperature water distributors (6), and control the water flow velocity through each water distributor to be within the laminar flow and low Reynolds number range; Adjust the flow rate of thermal or cold water storage based on the peak-shaving and frequency regulation signals of the power grid or the peak-shaving demand of heat or cold sources; By utilizing the opening and closing of the inlet and outlet water control valves (4) at both ends of the high-temperature inlet and outlet water pipe (2) and the low-temperature inlet and outlet water pipe (3), the operation of unidirectional injection or unidirectional extraction of high-temperature water or low-temperature water is realized, ensuring the balance of the inlet and outlet water volume of high-temperature water and low-temperature water.

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